派克比例阀Z2DB10VD2-4X/315一般说来，好像伺服系统都是闭环控制，比例多用于开环控制；其次比例阀类型要多，有比例压力、流量控制阀等，控制比伺服要灵活一些。从他们内部结构看，伺服阀多是零遮盖，比例阀则有一定的死区，控制精度要低，响应要慢。但从发展趋势看，特别在比例方向流量控制阀和伺服阀方面，两者性能差别逐渐在缩小，另外比例阀的成本比伺服阀要低许多，抗污染能力也强！
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3WE6B9-62/EG24N9K4 电磁换向阀
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DG5V-6CW-D-M-U-C6-11 220V 电磁溢流阀
DGMPC-5-ABK-BAK-30 液控单向阀
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